Question

Which one of the following will increase the voltage of the cell whose cell reaction is given below?

\[\ce{Sn + 2Ag+ -> Sn^2+ + 2Ag}\]

Options

• Increase in the size of silver rod.

• Increase in the concentration of Sn²⁺ ions.

• Increase in the concentration of Ag⁺ ions.

• None of the above.

Answer 1

Increase in the concentration of Ag⁺ ions.

Explanation:

The cell reaction is given below:

\[\ce{Sn + 2Ag+ -> Sn^2+ + 2Ag}\]

According to the Nernst equation, increasing the concentration of the oxidising agent (here, Ag⁺) shifts the reaction forward and increases the cell potential. Increasing Sn²⁺ would reduce the voltage, and the size of the Ag rod has no effect on potential.